Door-alarm



(No Model.)

W. F. LUTZ, Jr. DOOR ALARM.

N0. 434,876. Patented Aug. 19,1890.

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UNITED STATES PATENT OFFICE.

WILLIAM F. LUTZ, JR, OF BROOKLYN, NEW YORK.

DOOR-ALARM.

SPEGIFIGLTION forming part of Letters Patent No. 434,876, dated August19, 1890. Application filed September 28, 1889- Serial No. 325,376- (Nomodel.)

To all whom it may concern: I

Be it known that I, WILLIAM F. LUTZ, Jr., a citizen of the UnitedStates, and a resident of Brooklyn, in the county of Kings and State ofNew York, have invented certain new and usefullmprovementsinDoor-Alarms,of which the following is a specification.

My invention has reference to improvements in door-alarms; and itconsists in certain novel and peculiar features of construction, asfully pointed out in the following specification and claims, andillustrated in the accompanying drawings, in which Figure 1 represents avertical section of a door provided with my improved alarm. Fig. 2 is anelevation of the same.

Similar letters indicate corresponding parts.

In the drawings, the letter A designates a door, hinged as usual, and Bis the transom.

C is the gong or bell, which is secured to a suitable base-plate D,attached to the door.

To the transom B is secured a horizontal plate E, which is arranged tobe engaged by a toothed Wheel F, mounted upon a spindle a, havingbearings in suitable brackets on the base-plate. This toothed wheel F,which I shall hereinafter term the actuating-wheel, engages with andvibrates the lever-arm Z; of the hammer G, said arm I) being pivoted atc to the base-plate. WVhen the door is swung open, the actuating-wheel Fis rotated by frictional contact with the plate E, thereby repeatedlysounding thebell, until said Wheel is drawn beyond the reach of theplate. In closing the door the bell is similarly sounded.

In practice I make the plateE of resilient metal and cover its lowersurface with canvas,

leather, or other material to obtain a good frictional surface cl.

It is evident that the actuating-wheel could be in the form of a gearand arranged to engage with a rack on the transom and that either devicecould be applied to a sliding door or to a window.

If desired, the bell could be applied to the transom or other part ofthe door-frame and the plate E secured to the door.

What I claim as new, and desire to secure by Letters Patent, is

1. An alarm consisting of a plate secured to the transom or otherstationary part and projecting at right angles therefrom, a gong securedto the door or moving part, a hammer arranged to strikethe gong, and anactuatingwheel in operative connection with the plate and With thehammer for repeatedly vibrating the latter, substantially as described.

2. An alarm consisting of a plate secured to the transom or otherstationary part, a gong secured to the door or moving part, apivotedhammer arranged to strike the gong, and a toothed actuating-wheelarranged to bring its teeth into contact with the plate and to engagedirectly with the hammer to repeatedly vibrate the same, substantiallyas described.

In testimony that I claim the foregoing as my invention I have signed myname, in presence of two witnesses, this 11th day of September, 1889.

\YILLIAM F. LUTZ, JR.

